Several unreleased songs had been planned for inclusion on her studio albums Britney (2001), In the Zone (2003), Blackout (2007), Circus (2008), and Femme Fatale (2011), but were ultimately rejected.

Federal Reserve System central banking system of the United States.

Established in 1913, it began to operate in Nov., 1914.

The capital and largest city is Kabul .global warming the gradual increase of the temperature of the earth's lower atmosphere as a result of the increase in greenhouse gases since the Industrial Revolution .

The temperature of the atmosphere near the earth's surface is warmed through a natural process called the greenhouse effect.immigration entrance of a person (an alien ) into a new country for the purpose of establishing permanent residence.

There are many registered tracks included under the unreleased section that have not been commercially released, but have gained media attention or were confirmed by Spears herself.